Home | History | Annotate | Line # | Download | only in cmake 
      1 include(CheckCSourceCompiles)
      2 
      3 macro(check_const_exists CONST FILES VARIABLE)
      4   if (NOT DEFINED ${VARIABLE})
      5     set(check_const_exists_source "")
      6     foreach(file ${FILES})
      7       set(check_const_exists_source
      8           "${check_const_exists_source}
      9           #include <${file}>")
     10     endforeach()
     11     set(check_const_exists_source
     12         "${check_const_exists_source}
     13         int main() { (void)${CONST}; return 0; }")
     14 
     15     check_c_source_compiles("${check_const_exists_source}" ${VARIABLE})
     16 
     17     if (${${VARIABLE}})
     18       set(${VARIABLE} 1 CACHE INTERNAL "Have const ${CONST}")
     19       message(STATUS "Looking for ${CONST} - found")
     20     else()
     21       set(${VARIABLE} 0 CACHE INTERNAL "Have const ${CONST}")
     22       message(STATUS "Looking for ${CONST} - not found")
     23     endif()
     24   endif()
     25 endmacro(check_const_exists)
     26